Best answer by JimM
In older versions of Windows, you could reset the repository to solve this kind of problem. I suspect you can probably take care of this issue the same way in Windows 8.
Let's see if this helps:
First, you'll want to open an administrative command prompt. To do so, go to your desktop and bring up Task Manager. Go to File and choose "Run new task." On the screen that appears, check the box for "Create this task with administrative privileges." Then type:
cmd into the box and click Run.
At the command prompt, type:
NET STOP WINMGMT /Y
and hit enter.
REN %WINDIR%SYSTEM32WBEMREPOSITORY REP.OLDand hit enter.
Close the window, and restart your computer.
That's the only suggestion I've got for this issue, being that it's ultimately a problem with Windows itself rather than with Webroot. Let me know if it helps! :)